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<title>OnChange</title>
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<p class="Decl"><b>property</b> OnChange: TNotifyEvent; </p>
<h2>Description</h2>
<p class="Body"><span class="EmptyRef">OnChange</span> is called immediately after 
  the object changes. For example, <a href="../_Body.htm">TNotifiablePersistent</a>'s 
  descendant <a href="../../TBitmap32/_Body.htm">TBitmap32</a>, uses the <span class="EmptyRef">OnChange</span> 
  event to notify its parent that something was changed in a bitmap, and the screen 
  image must be updated.</p>
<p class="Body">Generation of <span class="EmptyRef">OnChange</span> events can 
  be prevented by calling <a href="../Methods/BeginUpdate.htm">BeginUpdate</a>.</p>
<p id="hidden">[See also] <a href="../Methods/Changed.htm">Changed</a> </p>
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